Spline Interpolation - Siemens sinumerik 840d Programming Manual

04.00
5
840D 840D
NCU 571 NCU 572
NCU 573
5.2

Spline interpolation

Introduction
The spline interpolation function can be used to link
series of points along smooth curves. Splines can be
applied, for example, to create curves using a
sequence of digitized points.
There are several types of spline with different
characteristics, each producing different interpolation
effects. In addition to selecting the spline type, the
user can also manipulate a range of different
parameters. Several attempts are normally required
to obtain the desired pattern.
Programming
ASPLINEX Y Z A B C
or
BSPLINE X Y Z A B C
or
CSPLINE X Y Z A B C
Function
In programming a spline, you link a series of points
along a curve.
You can select one of three spline types:
− A spline (akima spline)
− B spline (non-uniform, rational basis spline,
NURBS)
− C spline (cubic spline)
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SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA) − 04.00 Edition
FM-NC 840Di
Special Motion Commands

5.2 Spline interpolation

P2
P3
P1
P4
P1 to P6: Predefined coordinates
5
P6
P5
5-151